Motion-picture apparatus



June 25, 1929. J. GRIEM 1.718.782

MOTION PICTURE APPARATUS Fild March 14, 192'! 2 Sheets-Sheet 1 g mm Z flaw June 25, 1929. "J. GRIEM 1.718.782

MOTION PICTURE APPARATUS Filed Maioh '14, 192'? 2 Sheets-Sheet 2 Patented June 25, 1929.

UNITED STATES PATENT orricr.

JULIUS GRIEM, OF APPLETON, WIBGONSIN.'

MOTION-PICTURE APPARATUS.

Application filed March 14, 1927. Serial No. 175,104.

that a smoothly dissolving effect is produced and one picture fades out gradually while the other picture gradually builds up in strength in exact proportionto the dimming of the first picture, thus avoiding any abrupt or irregular changes. I

Further objects are to provide a device which is eminently practical and easy to construct and install, and which is so made that it may be knocked down or separated into its major component parts to permit the shipping thereof in a'compact formation.

Further objects are to provide a device in which the several parts are easily adjustable vertically, and in which the shields are independently adjustable laterally, so that an exact relation between the projector and the shields may be easily attained.

A further object of this invention is to provide a device of the above described type which does not require any thought on the part of the operator and merely requires the simple manipulation of a crank or lever, such operation automatically and simultaneously gradually dimming the picture from one projector and gradually increasing the strength of the picture from the other projector.

An embodiment of the invention is shown in the accompanying drawings in which:'

Figure leis a sectional view through the front wall ofa projecting room showing dia-' V grammatically a pair of projectors and showing the apparatus in position:

Figure 2 is an elevatlon of the structure shown in Figure 1;

Figure 3 is a sectional view on the line 3-3 I of Figures 1 and 2; T

Figure 4 is a sectional view on the line4-4 of Figure 2.

-:Referring to the drawings, it will be seen that the'front wall 1 of a projecting room has been shown as provided with a pair of outlet apertures 2 and 3, for the rays of light from tli e projector, indicated diagrammatically at'4 and 5. The-device is mounted inwardly of the wall 1, as shown in Figure 1, and comprises three supporting members 6, 7, and 8, which are attached to theinner face of the walL' These supporting members are in reality guides having overhanging flanges between which slides 9, 10, and 11, are carried. These slides are each provided with set screws 12 which are adapted to bind against the body of the guides to thus lock the parts in their adjusted position. The construction is more clearly shown in connection with the central guide shown in enlarged section in Figure 3. This central guide carries the slide 10, as previously stated, and this slide is slightly different from the other slides.

It consists of an angularly shaped member which carries a horizontal crank shaft 13 provided with amanipulating crank 14. The

"shaft also carries a bevel gear 15 which detachably joined in any suitable manner,

preferably by means of a pin or member 24 (see Figure 2) which sockets in recesses formed in the abutting ends of the sections and is secured to each section by-means of a set screw 25, thus permitting ready separation of the elongated bar's into their component parts.

The bars are rectangular in cross section and are each carried by the three guides 9,

10, and 11. These bars carry adjacent the "openings 2 and 3 through the front wall of jectm tongues or slide one u constricte even manner.

I essary for the operator crank 14 in -the desired direction to cause one located opposite sides of the respective bars, as shown particularly. in Figure 1, so that they will slide past each other without interference.

a. The shields 26 and 27 are formed as stated, in pairs, and each pair is provided with a cutout of approximately semi-circular cont-our roughly,which is defined by inwardl proserrations 32 (see igure 2). ese serrations project inwardly into the cutout portions of the shields and when the shields are separated the do not interferewith the free passage 0 the light rays from the projector. However, as the shields are drawn towards each on the other, the area of opening is and the fingers or serrations 32 gradually project into the light beam, and due to their tapered formationxcut ofi more and more ofthe light rays in a very gradual and It is to benoted also that the shields are so.

when one of t e pairs of shields is closing,

the other pair is opening and also thatthis.

opening permits a very gradual building up of the strength of the assing light beam.

It will be seen; there ore, that all that is necto do is to rotate the pair of shields to cut bit the light and the other pair to move out of the light beam to thus permit its gradual building up while the .other beam is graduall cut off.

Thus, a perfect disso ving effect is produced by this simple and easily manipulated device. The exact vertical adjustment desired may obviously be had by loosening the set screws 12 of the slides 9, 10, and 11, and adjusting them vertically,

thereafter locking the set screws. The horizontal adjustment of, each individual slide is readil attained by loosening the set screws 31o properly positioning the slide horizontally upon its respective bar.

' Thereis no chance of separation of the slides one from the other, as they are guided at.

. the r lower ends by the bars themselves, and at their upper ends by their interfitting ed es.

It is to be noted also that the device is readi- 1y adaptedto-be knocked down and shipped in a compact formation. -It .is merely" necessary to loosen the set screws 25- and separate thebarsintotheirpa-rtsfl I f Although the invention has-been described in considerable detail, such-descri ion is intended as illustrative rather than imiting as the invention may be variously embodied and as the see of such invention is to be deter- -ll. Altbo'n the invention haibeen described as nsedvntb two projectors, itisto be underother and graduallypositioned upon the bars'that bers, means for v 3. In a motion picture apparatus,

theclamps 30- and -versely connected to the bars with 1. In a motion picture apparatus, the combination of a projecting room having a front wall provided with a pair of apertures a pair of projectors mounted behind the apertures, a plurality of guides secured to said-wall, slides vertically adjustable in said guides, a pair of bars slidably. carried by said\slides, means for simultaneously reciprocating said bars in reverse directions, and a pair of shield members located at each aperture and carried by said bars withthe elements of each pair positioned one in front of the other, with the corresponding element ofeach pair connected to opppsite bars, whereby upon relative motion of t e bars, reverse action ofthe shields is produced. I

2. In a motion bination of a pro ecting-room having a front wall provided with a pair of apertures, a pair of projectors mounted behind the apertures, a plurality of members supportedby said wall, a pair of bars slidably carried by said memsimultaneously reciprocating said bars in reverse directions,

by said bars with the elements of each pair positioned one in front of the other, the free edges of the elements of each pair being slid ably interlocked.

the combination of a plurality of guides for attachment to asupport, a plurality. of slides cara pair of shield members located at each aperture and carried riedby said guides and-vertically adjustable therein, a pair of detachably jointed bars slid ably carried by said slides, racks carried by said bars, a pinion located between and meshing with said racks, a crank for operatin said pinion, a pair of shields carried by sai bars and each pair having elements carried by different bars, the elements of one pair being rerespect to the elements of the other pair, said shields being detachable from said bars. v

4. In a motion picture apparatus, the com? bination of a pluralit of members attached to a support a pair of ars slidably carried by said mem rs, rackscarried b said bars, a pinion located between and nice ing with said racks, a crank for o ratin said pinion, a pair of shields carriedv said ars and each having elements carrie by diflerent bars, the elements of one air being reversely connected to In testimony that I claim the foregoing I havehereunto set my hand at Appleton, in the county of ()utagamie and State of Wisconsin.

' JULIUS GRIEM.

.the bars wit respect to the elements of the 4 other pair. 

